SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1b576bed4d47a4fb7112567d667793764873c9dd98f08c45051d6aea96391bb' 
  AND token = 'KOrzShUJaeG0gqMLa1Nw+QETcFe4Y7wVIGH9HKD8LJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00115

JSON explain

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