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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3638db5bf991e1618834b27d5b101de394e113f972b1c113bd913e12333c838' 
  AND token = 'xqM+0y65HBvGlYRBX7z/aWW743U1GURjJd0wqImYbfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}