SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3da160fa3b57674282d43e1110c66edfa3e95fb8c12ef7c9ef608c96f2c595e' 
  AND token = 'Eyuw3smmOVjlZUV5WYVKlfs+VKJzzbZiPvTmn9T4KkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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