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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9072c8711efec8223b450bee7bfa3d11171f48d817e855fdb3570a116002e1d' 
  AND token = 'bQQkhkJU/pcz2ic1aJuC03u8Zk3Y/UuVkhDU57CNTwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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