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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04f7f31d3823c3ec29c3d671e90b373d4977210c69cdcdd242c078061e207232' 
  AND token = 'pk7SX8eHUS+34sG0sslkgRjwV4NdrAalXE7eLEcOOj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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