SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e59ec4e6f2d2b725375bb39f06ff790cb3abc4f78afe78b24c2069f65f06f75' 
  AND token = 'spC1laFe+RzWW5+wpjPHJ5mG33E+vnk5ws/ziZBNKa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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