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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b08f292b45b7fce93bc05876327297946cd618d841ce8805f22bc42048d7c04' 
  AND token = 'qiGYRJaXiKt8/8TJftIBVbr7KdA3ee0ukr1NceZiJrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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