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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08f55e310b974aca6942dca8e65a3093423e7e5b0c78a4e0d07e988a570d8ef8' 
  AND token = '0vmJr4tEZZM6EULXdCW+JZN9aet52+NPx+vlP0/BUhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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