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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd145b995bd72efe97dd1f31e15754b9c207c4ee8202a6fc4ca6c44ff659c063d' 
  AND token = 'YRrakIWVffoebYiBG8vQbkN+2s+z7Kx1MLny+U/17YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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