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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca467095e769b420ee8b0e49d5b718f981e73ad8f30ecba914df9b578128d40a' 
  AND token = 'X/rbUAH8CKu9NLyCmPxi9E3uIW0WQ+en66hPJOHucls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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