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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd66e340e9d7a7392b8773000fb71a2e9ed58ca2b0468fadf22d20fb7b9f44cbb' 
  AND token = 'XS+zRqYj9BISszmdXgm6fArF1jd4Vl6ypEXxmkiLrn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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