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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2efaaf8afb92ccb16ea836c488c93b2ac54352b668a4915db62718e03b0edd5' 
  AND token = 'Dgm/NUC9TXgqBsIJFpuq6QfiR5rs4ygOpv0Up4LgUG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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