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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6791d240a5a99d98da36ab55f59c37e3c7cfd4986754a52dd9a4c6b3578d7688' 
  AND token = 'zq4HgAUrQP9pxgXEmfSp0UdHAp0aVDNtW0GNEu5szhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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