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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efc5e30cb212620d9d428b220d1e939a172e8a952d294444f77a462323d81a4c' 
  AND token = 'BkFeWXBzSF0UEFrE2b5Z4ZJEJ60UNKqEE8p3P0boFhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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