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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad4dca6fdb8caa38bf6d127b5a333b99dc92c23191fea0402b88dd72be908aaf' 
  AND token = 'pk/gdnylnZl9tdRU/ha0nVQd7/AzTWhO4TDtRSEeUKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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