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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13202c02d3cabe3a1e11f7c52f42b8e1e463c0934a9459179c3036f8254eeca2' 
  AND token = 'or9EA4YiHh9AclceUwFJ8M+12/IyJQOOyBuV1BT4U9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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