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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a7abffbdc02e69af0abc37cc0f4ebf17e85025af940e64cde181fe24cf51503' 
  AND token = 'xf/gB3Umw3MywqNiuXLFjSFkKy2tZbmFiOd/T/kjTP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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