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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1eeca606881a7fb979d38be409ae18751982d8144f02b94c9f57e3f08badd91' 
  AND token = 'UrojS/5mPeBXaRqxd9RZI55oJ9PbRY1APPlOFMv8XgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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