SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b3566ca839811f87be0cbc6cfdb35d971adf66942f4a83846578d8b46ab21ae' 
  AND token = 'Eqaz58+wgzBhKdpruW4xIjhheQZRtAyVbwEMRbgzcTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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