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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0a8ce7dc60676399c7a9308b289ace65aac2848dc908fc4c421d8548fa98a83' 
  AND token = 'ukkmWRVuMb0KMq80zUMnTzKMNVzUOq80QiQL3l0h+DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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