SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00603cc03884bff88852c8475f32af0e7def2965268401bc067ba7ff78a20aa2' 
  AND token = 'F/MrwhCvEpZ2VDV/avsGX2rj5tNgJgZmX7nCiAFBwLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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