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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec036da370b003942c4e0f2055a3d161250179d58a822f7e5d3dcfc6648d11ad' 
  AND token = 'p2EjZLhTIDXQrKCHiCFp+AzZvAgAXAxrDNWFyc+WZFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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