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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dece83b38449d5adf53b1159233e6d05f7f09cdec6853faee0cc880e5d72c79' 
  AND token = 'hQU6AFQ265jZIAhrAw0glvO/cQSYR0cFgoXZxVx1z9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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