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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e20c7c6ab3e270a6ae958636607ea7bffb44e60ca7488ff42020d986aaa0a9f2' 
  AND token = 'XrwXk2jeJ1L6gqY7h6AmVZvmiMEJPHslocgH17kx3sI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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