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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '823f53d034719ddbdad661789f593940d833f1ef43f31400e5001f31b0cadbc3' 
  AND token = 'fRgDf147mWyg0WZVa5GVVKAU+WnPT3eOzEhuPiVRExU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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