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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ea8cc9f34e4aa0aa5e16ed428dbea67a29a3528a7b8c42d4ab7c723cef8064' 
  AND token = '5Jje666A+n76gMEpUIPFZxs052MJba9jlzxiY3+zuxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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