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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f132e5c028d7912aec6934f529502cd60564b2ee7fe9eccb0dadff82f452c597' 
  AND token = 'fGI6PqKtJlaK9Vj5eH44rYe2pCdg/JJYB5aO2mbatFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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