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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4daed5829fde86caa2de20226a61db2835bac994b9a367a311766d08c9b6309b' 
  AND token = '2PmMWDM+l5ywHOsJ8B/SCuvv7V7OKtFs5FJliFK+7ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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