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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c82aa3b63725d55efda254064bf8bf446eb41f3aa30b8622a6ddb1e28b2bdcda' 
  AND token = 'QXRGDA9pbliJcywgzT2ervCi12K6reZH8yi4Z13YMxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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