SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a19f912fc2aef065bb8a2369d4f9dde8b10c2b25b350c8c4f49c40cd89fce66f' 
  AND token = 'NGcEnssqOvhX25TImQGxOJD/LB9uHCqCfxVSuQfZwOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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