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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43f9f81ae71603649d4da706f172ce16984a6810b0a2af2e3af948cc529c49ba' 
  AND token = 'GkcX9LQroEDtJDEC/Cq7Yhb54nkZV9xhw2rACgt0Vgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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