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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f71b1e4813272a5ba60a01c4e814925137067e5d73e6bd6294a447b12bc0216c' 
  AND token = '7wyEu0IFlt1gBstvqVmJggOAkEII3Hn/+femwiYMJYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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