SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9674d75e16c78e29c901ffcd97a7161b61adc4611f9e78459bf8f60e130d5657' 
  AND token = 'PfBHFQtzHUHujDJFYl6dk+CAhrpEaxXVo8vjg778WJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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