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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5d6cc04d0ebf4688a2d65aebe697170935a2a9669f327549f7dda1413007d95' 
  AND token = 'Aadh2+qvq/gajulantmRvDWu3d4JiuTsNn/C5c8Bt7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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