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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9d15e752568f9483bad830be89f23f1d2e8799a8cdf21c4dbbac09671067d8b' 
  AND token = 'm4M8twLo5QT9JDQiW/e5QgW8Adno/YIqi9XGqOrl9ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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