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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6138db0c87109197c0c4fa8b201482547998123a8f8ceb89cf2d4c857fe388c' 
  AND token = 'ghti+pV0AfmVtsDFst/806gg1K+sDM5XKLmtJd2eQRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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