SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd585fe821ce60d5e2faa05b435ea3dece467fad3b51873fac9c6e8b2c0fe658c' 
  AND token = 'EWAn4YnZMjF9UgQtG/Y+tKfysesBbLrzvHlhV1LvKZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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