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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b808bf117b8d6456b95e97868c90ba1a35c2334aeafd5f1c42da4e481405d27' 
  AND token = 'VeZngiyr4P9XdOA9gtOxouICZt+4LMh94fGcOC6D18k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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