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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c9cee55f67c5758ccd606898cfede4a5b1fe2816f0b0f51ca5047f098297047' 
  AND token = 'Uw1Ls7qHFjnL3Z+8YNbE2OzZSLok8Qpr5WpnlxyjUZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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