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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3d7638a1150b6622aa0109db4e76b165c115b0a9fe6ac07a450a79bb45cfd06' 
  AND token = '1qr8Njk/ZCJbRPkIyKuIkakey87u+Gp6J/wcf1p1dAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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