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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b5b384922ed507467fa7163e6fad638198cae8241c40e1ad8f72b2f030a32ad' 
  AND token = '4WJZo1xqcEcGkfwMjK5n7NN2A57hrNwtQZArZFB0pUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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