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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e35d31274609fc8b491259e007b343027fae6ad46baf5729e1a7349a59ddb39c' 
  AND token = 'IWtNAi3mY59RxCIQEPnmmRVsnRhuzJDgblKSTrcl35w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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