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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90f10855c7a046a40c881eb2f6efe8f10ab5eb4f915062b2204bcdb9c3719a37' 
  AND token = 'yjeBAQrIrCnZHwJYK7N3QsrU9FGmwJWQrGMtgerqeYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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