Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3810bd2b4663ed8e89468913e9129956971648929c9e7d1f0fba4215de74514' 
  AND token = '4I/2km06zhLpRDdZTof16Bqal8Rk1bxVWgH+NytyucQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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