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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1f50ed2ff1871158d179e94b3bdd283128e50cfd5f4e3664d6b7137e239d670' 
  AND token = 'm3Xc6HTZIYKuQ55GrD/4Sc34pjEGY3WiKaI+uGd5Or4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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