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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd684b29718ba488d6f8fb040bc828f379d617e310ac22570407f0f754fcb0a39' 
  AND token = 'QYnCCSLC6poRM1FeqSi59Uy9XA9Zsb8My9Ylrql9IHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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