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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15976b35338740023e6c75ca069fe09016f56995c828debce2d303d026676b0c' 
  AND token = 'u57brmvEcAk7h0fNQlwzagToGE9gZ4Lu0zlTfcdNLJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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