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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '300ae4bd12b7744939a7e9698af10314e3f07976103d751ddd1d049b1e096788' 
  AND token = '7xrVYoulQf2lqwAAJ56CxT3lxxyGme5JbouUB/o1VKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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