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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4541ef1e94ccd0d1fa7f2246ccb088649fb6c8c5eb805fe5ec100eec66b49ed6' 
  AND token = 'mznrfcdjIYIvGHLxSs0EwmN9jLmXcF+hkwZk6/MEesw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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