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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2519d653528c54eb8c3780ddf17742958bda5b8c3ec2bae0d4b7db4b89c2a3fb' 
  AND token = 'uk/ohFjYB68n07L/J149oKPrV40DZes2mbPmtv6/xO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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