SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1302c142a60f1de2476965b3c12cad053c278f00c9bb1725d9fbd6199aaf093' 
  AND token = 'bSWCAR1FyZ9LCk9spvpKtV/8nzPZ45N6uhPKGJzmLZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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