SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f7d3f9f31718c659ebeea48abefea36aebd66a1e7283c0c4cf0d8b26d99ad76' 
  AND token = 'FFWlnnIi0TofcT9bhtt8HjETGFBwA+BA5Xdxhq/A7EU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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