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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11091d7c11a4d62a6c7e07aeef07a2ef17d32c40643c614b0c0dcdbaa95f7f54' 
  AND token = 'Vf1oorlUK1lctQ+RoajY5MJjDxA9S+fMtaVojGO2ckc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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