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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7557af7dabf51e19f81f68fac274679a9acb84178f9263ab7dbdd319c752d34' 
  AND token = 'wbdleokzARL7UPL7mryDZvo5I5W9wd4An7CcIAwHgSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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