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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f41fb256b9f5d893c38ece3518ea5b5dcd8c9e74d8ae0b9fda2e7c72cb213ea' 
  AND token = 'SsmaLxLCqO3XyWfgNZlcOlVllO+ZkIeUZCyz24zaEhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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