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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48ddd831b367184bd7f10fd0cadbf334759d17b6089ea52d320fbb1b758bc1b7' 
  AND token = '6PDDnwSw6arKLaY2JFfOiKdL7si0bmJK/OuRf65Vnr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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