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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de07d640dbc825a6df30cf07caa3434cba941b57dd5edacf69d2e6cfbae8412d' 
  AND token = 'Z6OWvN6wsxjnCasXolYb+KIJHNB5UmUq8sUP1dlaCgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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