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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45d5a3e573b1109a81cd7b6ab0f212629d815d606eeb6ab96d6a2e93da9dc83f' 
  AND token = '8s61Utp3CjLwNYXkrVjIwIjYVun3C2WEcwVJhAj5r+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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