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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c648f140a0dafbb44f2a9c5e0fa70400a4563e2b9ec34e1e0e153c587e8d6ad8' 
  AND token = 'P3fEzkTjnAxEzmyXXjF8Zrr+XHcXgJSFfkqBb+mhVVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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