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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c320c7af4ba19b95dc607c85be09f303ec7aa7569cb6d112201353252c344e61' 
  AND token = 'idQRKpRWcmUwQ8DqVnXoJhW4sY9dhUkP7fR9XRnpe1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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