SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b745e6b4b147f32a52e117a0d690b0d465adfb55291198975c4771d9b08a61f7' 
  AND token = 'wxn5kxzaXS+STNRUwaX5mrIhqllwYbi/g2r+VViP2Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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