SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '652ca07bd9031c5f576549cf0a1983c89579b17f375169264f42f1b0557929fd' 
  AND token = 'jNhDgGORmzp7dNjLyPeVZBm5svJcOLAUym3HT3Y7sTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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