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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df7e5e77865500e6f742746114566842636ca46e1db1493088129dcc809423f6' 
  AND token = '0dYXhQc/TXFim6zZThp02gSO/jdc2scyJFUqKOWSIKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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